Hi Jeremy,
Thanks for sharing with us the related screenshots.
Based on my test, in the List view, when there are more than 30 items in one group, there will be a Show All button to access that group to see all items. In the Tiles view, there will be a See more button if the page cannot display all tiles in one group
or there are more than 30 items in a group. I don't find some related settings to directly show all items in a group. For this part, you may submit the feedback via
SharePoint Uservoice. It's the best way to influence our products and services.
For the second question, we need to collect more info for further investigation:
- Which browser are you using? Change to other browsers to see if they have the same behavior when grouping by in Tiles view.
- Your account and tenant info. I have sent you a private message to collect the privacy info.
- Check if the issue occurs in other libraries. It lets us know if the behavior is related to specific library.
Best regards,
Tim